<?php
/**
 *
 */
abstract class Zend_Sql_Abstract
{
	public function __toString() {
		try {
			return $this->toString();
		} catch (Exception $e) {
			return '';
		}
	}
	public function toString() {
		require_once 'Zend/Sql/Exception.php';
		throw new Zend_Sql_Exception('Not implemented');
		return '';
	}
	public function isValid($data, $context) {
		require_once 'Zend/Sql/Exception.php';
		throw new Zend_Sql_Exception('Not implemented');
		return true;
	}
}
